The Model R Drain Cleaner is professionally engineered to clean 3"-6" drain lines for distances up to 100ft. The unit features a heavy duty 1/3HP motor, extra large steel tubing frame, and snap-lock tool connectors which eliminates screws rusting or losing a tool in the line. The Model R also features the industries toughest 3/4"x100" Tr--Max cable with added flexibility and reduced kinking. A typical application of the Model R is a mainline running from the house to the street